you've been to rocket-making factories, as we discussed at the top of the program, but the technology of how the rockets are being fired has changed. >> reporter: yes. before what they were doing was these quick launches. they had three minutes just on to set up the rocket, light it and leave. aiming really didn't come into it. now they have automated remotely controlled launching systems that are buried under the sand in some of these empty lots just around here. and so they can -- they've been there for a while. and somebody just presses a button and off they go. a much quicker, easier, safer for the hamas fighters system to use. >> reporter: but certainly dangerous for any residents living in those areas living nearby. >> reporter: definitely because oftentimes there is a return strike from the israeli air force. and those are some very big blasts out there and some very crowded parts of town. >> reporter: barbara starr, we heard earlier from an israeli official who said the preparations are pretty much complete for a ground offensive by israel into gaza if they decide that's neces